Positive FRER negative cheapie, is this ok?

Hi friends! I am around 12 dpo give or take and got an obvious positive on a FRER. The pregmate cheapie was negative though. I know HCG is a range and it is based on implantation date, but has anyone else experienced this? I will test again in a few days to see if line progresses and if the cheapie is positive. I know FRER is much more sensitive, but on this app I see so many women showing positive lines on the cheapies very early (it is hard not to compare). Any feedback would be greatly appreciated.